PRACTICE SET- 2
Q.1:- Two materials have resistance temperature coefficients of 0.004 and 0.0002 respectively at a given temperature. In what ratio should the wires made of these materials be connected in series so as to have an overall temperature coefficient of 0.002?
(a) 1:2(b) 2:3(c) 9:10(d) 15:16
Q.2:- Consider the two fields,
E = 120 � cos (10⁶� t- x) V / m
H = A cos (10⁶� t- x) / m.
The values of A and β which will satisfy the Maxwell’s equation in a linear isotropic, homogeneous, loss-less-medium with = 8 and
= 2 will be
Q.3:- A chopper operating at a fixed frequency is feeding an R-L load. As they duty ratio of the choppe is increased from 25% to 75%, the ripple in the load current.
Decreases, reaches a minimum at 50% duty ratio and then increases.
Increases, reaches a maximum at 50% duty ratio and then decreases.
Keeps on increasing as the duty ratio is increased.
Q.4:- A sinusoidal waveform, when observed on an oscilloscope, has a peak to peak amplitude of 6cm. If the vertical sensitivity setting is 5 V / cm, the rms value of the voltage will be
(a) 10.6 V(b) 11.1 V(c) 12.6 V(d) 15 V
Q.5:- Which of the following is an example of an open-loop system?
Respiratory system of an animal.
Stabilization of air pressure entering into a mask.
Execution of a program by a computer.
Q.6:- A binary tree T has n leaf nodes. The number of nodes of degree 2 in T is
(a) n(b) n – 1